Methods, systems, and programming for refreshing web page URL snapshots are disclosed. A print job is analyzed to determine at least one sheet feed device and at least one post-processing device to be used in executing the print job, and states of the determined devices are checked to determine at least one of the sheet feed device and the post-processing device to be caused to start a preparatory operation in advance before the print job is executed. This enables the enhancement of freedom degree and so on in circuit designing according to conditions. The pressure switch recloses upon sensing a decrease or loss of pressure, at which point a relay communicating closes to complete an electrical circuit between the power source and alarm panel. Such an intermediate wall 301 partitioning the ink tank chamber 11 into two space parts 11a and 11b placed side by side in an ink injection direction is disposed in the ink tank chamber 11 and is formed with a through part 301a through which ink can be injected.